To build the Breakbeat Breadboard you can use either a breadboard or a Perma Proto board. The only real differences in the builds will be the use of optional header sockets for the Perma Proto build, and soldering wires to the Perma Proto instead of just poking wires into the breadboard.
Follow the diagrams here for either build.
Kee Boar Pins
Solder header pins to the Kee Boar (similar to this Feather configuration), then press it into the breadboard as shown in the diagram.
For the Perma Proto build you can solder the pins into the board or use optional header sockets as shown here.
Audio Noise Reduction
You'll build a small RC circuit to reduce some high end noise created by the PWM audio output of the board.
This consists of a ~1kΩ resistor and ~2.2µF electrolytic capacitor that cut high frequency signal. There is also a 220Ω resistor to help reduce pops when plugging the audio cable in or out.
This runs the filtered signal to the 3.5mm audio jack. Since we're using mono audio, the left and right channels of the TRS jack are jumpered together.
You'll add a set of eight tactile switches to trigger the different audio loops. These all run from individual GPIO digital input pins to ground on the KB2040.
Next, you plug in USB to power and program the Kee Boar, and then a 3.5mm stereo cable to an amplifier or powered speaker.